Preferred syntax:
.VCCAP label n+ n- nc+ nc- expression
Alternate syntax:
Gxxxxxxx n+ n- VCCAP nc+ nc- expression
Voltage controlled capacitor.
All probes that apply to ordinary capacitors also apply here.
N+ and n- are the positive and negative element (output) nodes, respectively. Nc+ and nc- are the positive and negative controlling nodes, respectively. Value is the transfactor in Farads per volt.
The simulator will faithfully give you a negative capacitor if it
seems appropriate. Usually, this part is used with a behavioral
modeling function, like PWL, which allows you to specify a table of
capacitance vs. voltage.